/*
 * Copyright (c) 2011 Junichiro Okuno
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The views and conclusions contained in the software and documentation are those of the
 * authors and should not be interpreted as representing official policies, either expressed
 * or implied, of Junichiro Okuno.
 */

package tcp_net.mail.smtp.states;

import tcp_net.Context;
import tcp_net.mail.MailBoxFileManager;
import tcp_net.mail.smtp.commands.*;
import tcp_net.MessageProcessor;
import tcp_net.mail.EmailMessageProcessor;
import tcp_net.mail.smtp.states.debug.DebugInfo;
import java.util.List;
import java.util.ArrayList;

/**
	Transaction state for SMTP server
	@author J. Okuno
*/
public class Transaction extends SMTPState
{
	/**
		Debug information
	*/	
	private final static boolean DEBUG = DebugInfo.TRANSACTION_DEBUG;
	
	/**
		This method process a defined request (a command and its arguments) from a POP3 client
		@param pmp a message processor
		@param str_command a command request in a string text format
		@param arguments a list of arguments in a string text format 
		@return a list of replies
	*/
	public List<String> process(MessageProcessor pmp, String str_command, List<String> arguments)
	{
		 MailBoxFileManager man = ((EmailMessageProcessor)pmp).getMailBoxFileManager();
		
		//NOOP
		if(str_command.equalsIgnoreCase("NOOP")) 
		{
			return (new NOOP()).execute();
		}
		
		//EXPN
		else if(str_command.equalsIgnoreCase("EXPN")) 
		{
			return (new EXPN()).execute();
		}
		
		//VRFY
		else if(str_command.equalsIgnoreCase("VRFY")) 
		{
			return (new VRFY()).execute();
		}
		
		//EHLO
		else if(str_command.equalsIgnoreCase("EHLO")) 
		{
			if(arguments.size()==1) { return (new EHLO(arguments.get(0))).execute(); }
			return new EHLO("").execute();
		}
		
		//HELO
		else if(str_command.equalsIgnoreCase("HELO")) 
		{
			if(arguments.size()==1) { return (new HELO(arguments.get(0))).execute(); }
			return new HELO("").execute();
		}
											  
		//MAIL
		else if(str_command.equalsIgnoreCase("MAIL")) 
		{
			String mail_add = getSubstring(arguments.get(0),'<', '>');
			return (new MAIL(mail_add, man).execute());
		}
		
		//RCPT
		else if(str_command.equalsIgnoreCase("RCPT")) 
		{
			String mail_add = getSubstring(arguments.get(0),'<', '>');
			return (new RCPT(mail_add, man).execute());
		}
		
		//DATA
		else if(str_command.equalsIgnoreCase("DATA")) 
		{
			pmp.changeState(new Data());
			return (new DATA().execute());
		}
		
		//QUIT
		else if(str_command.equalsIgnoreCase("QUIT")) 
		{ 
			pmp.getHandler().setCloseConnection();
			
			if(arguments.size()==1)
			{
				return (new QUIT(arguments.get(0))).execute(); 
			}
			else
			{
				return (new QUIT()).execute();
			}
		}
		
		else 
		{	
			return null;
		}
		
		//Should not be there
		//return null;
	}
	
	
	
	// CommandAnalyser not working
	// So using this method instead
	/**
		Outputs a substring from a starting char (inclusive) until an ending char (inclusive)
		@param message a string 
		@param start a starting char
		@param end an ending char
		@return a substring
	*/
	private String getSubstring(String message, char start, char end)
	{		
		String substr = "";
		boolean started = false;
		for(int i=0; i < message.length(); i++)
		{
			char ch = message.charAt(i);
			//DebugInfo.print(DEBUG, "ch: "+ch+" count: "+i);
			
			if(started)
			{
				if(ch == end) { break; }
				substr += "" + ch;
			}
			
			if(ch == start) 
			{
				if(!started) { started = true; }
			}
		}
		
		//DebugInfo.print(DEBUG, "Substring: "+substr);
		
		return substr;
	}
}